Image processing apparatus

Abstract

An image processing apparatus has a reading device for reading an original, a conveying device for conveying the original to a predetermined reading position, a first detecting device for detecting the state of the original on the basis of the output of the reading device, and second detecting device for detecting the state of the original conveyed by the conveying device. The first detecting device is used to detect the state of the original when the conveying device is not used.

What I claim is: 
     
       1. An image processing apparatus comprising: reading means for reading an original and outputting an image signal;   conveying means for conveying the original to a predetermined reading position;   selecting means for selecting operation of said conveying means;   first detecting means for detecting a size of the original based upon the output signal of said reading means; and   second detecting means for detecting a size of the original conveyed by said conveying means; and   control means for controlling said second detecting means to detect a size of the original during operation of said conveying means.   
     
     
       2. An image processing apparatus according to claim 1, wherein said reading means includes means for scanning the original, and wherein said first detecting means detects the size of the original during a pre-scan. 
     
     
       3. An image processing apparuats according to claim 1, wherein said control means inhibits operation of said first detecting means upon the operation of said conveying means. 
     
     
       4. An image processing apparatus according to claim 1, further comprising means for detecting the density of the original and means for controlling an area of the original where the density is detected which area is selected in response to the size detected by at least one of said detecting means. 
     
     
       5. An image processing apparatus comprising: reading means for reading an origial and outputting an image signal;   detecting means for detecting a density of the original based upon an output of said reading means; and   control means, responsive to the original, for controlling an area of the original to be detected by said detecting means;   said control means controlling said detecting means such that said detecting means detects the density of an inner area of the original.   
     
     
       6. An image processing apparatus according to claim 5, further comprising means for detecting a size of the original and wherein said control means controls said detecting means in accordance with the detected size of the orginal. 
     
     
       7. An image processing apparatus according to claim 6, further having means for automatically detecting a size of the original. 
     
     
       8. An image processing apparatus according to claim 5, wherein said detecting means detects a maximum density of the original. 
     
     
       9. An image processing apparatus according to claim 5, wherein said detecting means detects a minimum density of the original. 
     
     
       10. An image processing means according to claim 5, further comprising means for detecting a supported position of the original with respect to a predetermined read position, wherein said control means controls said density detecting means in accordance with the detected supported position of the original. 
     
     
       11. An image processing apparatus according to claim 5, further comprising decision means, responsive to the density detected by said detecting means, for deciding a processing condition for processing the image signal output from said reading means. 
     
     
       12. An image processing apparatus according to claim 11, wherein said processing condition is a threshold for binarizing the image signal. 
     
     
       13. An image processing apparatus comprising: reading means for reading an original and outputting an image signal   first, detecting means for detecting a size of the original; and   second detecting means for detecting a density of the original in response to the output signal of said reading means;   wherein said second detecting means is controlled in response to the size of the original detected by said first detecting means.   
     
     
       14. An image processing apparatus according to claim 13, wherein said control means controls said second detecting means to control a detection area of the original. 
     
     
       15. An image processing apparatus according to claim 13, wherein said control means controls a detection time of said second detecting means. 
     
     
       16. An image processing apparatus according to claim 13, wherein the detection by said first detecting means is executed prior to a detection by said second detecting means. 
     
     
       17. An image processing apparatus according to claim 13, further comprising decision means, responsive to the density detected by said second detecting means, for deciding a processing condition for processing the image signal output from said reading means. 
     
     
       18. An image processing apparatus according to claim 17, wherein said processing condition is a threshold for binarizing the image signal. 
     
     
       19. An image processing apparatus according to claim 13, wherein said second detecting means detects a maximum density of the original. 
     
     
       20. An image processing apparatus according to claim 13, wherein said second detecting means detects a minimum density of the original. 
     
     
       21. An image processing apparatus comprising a platen for supporting an original thereon;   reading means for reading the original and outputting an image signal;   first detecting means for detecting a supported position of the original on said platen;   second detecting means for detecting a density of the original in response to the output signal from said reading means; and   control means for controlling said second detecting means in response to the supported position detected by said first detecting means.   
     
     
       22. An image processing apparatus according to claim 21, wherein said control means controls said second detecting means to control an area necessary to detect the density of the original. 
     
     
       23. An image processing apparatus according to claim 21, wherein said control means controls a detection time for said second detecting means. 
     
     
       24. An image processing apparatus according to claim 21, wherein a detection by said first detecting means is executed prior to a detection by said second detecting means. 
     
     
       25. An image processing apparatus according to claim 21, wherein said second detecting means detects a maximum density of said original. 
     
     
       26. An image processing apparatus according to claim 21, wherein said second detecting means detects a minimum density of said original. 
     
     
       27. An image processing apparatus according to claim 21, further comprising decision means, responsive to the density detected by said second detecting means, for deciding a processing condition for processing the image signal output from said reading means. 
     
     
       28. An image processing apparatus according to claim 27, wherein said processing condition is a threshold for binarizing the image signal. 
     
     
       29. An image processing apparatus comprising: feeding means for feeding an original to a predetermined position where the original is read;   reading means for reading the original fed to the predetermined position and for outputting an image signal;   first detecting means for detecting a size of the original while being fed by said feeding means;   second detecting means for detecting a density of the original being fed by said feeding means in response to the image signal of said reading means; and   control means responsive to the size of the original, for controlling an area of the original to be detected by said second detecting means.   
     
     
       30. An image processing apparatus according to claim 29, further comprising decision means, responsive to the density detected by said second detecting means, for deciding a processing condition for processing the image signal output from said reading means. 
     
     
       31. An image processing apparatus according to claim 30, wherein said processing condition is a threshold for binarizing the image signal. 
     
     
       32. An image processing apparatus comprising conveying means for conveying an original to a predetermined reading position;   first detecting means for detecting the size of an original at the reading position;   second detecting means for detecting the size of the original which is being conveyed by said conveying means;   scanning means for scanning the original at the reading position; and   control means for controlling said scanning means in response to an output from either one of said first and second detecting means.   
     
     
       33. An image processing apparatus according to claim 32, further comprising density detecting means for detecting the density of the original at the reading position and control means for controlling said density detecting means in response to the output from either one of said first and second detecting means. 
     
     
       34. An image processing apparatus according to claim 32, wherein said control means controls said scanning means in response to the output from said second detecting means when said conveying means is utilized. 
     
     
       35. An image processing apparatus according to claim 32, wherein said control means controls said scanning means in response to the output from said first detecting means when said conveying means is not utilized. 
     
     
       36. An image processing apparatus according to claim 32, wherein said control means controls a scanning distance of said scanning means. 
     
     
       37. An image processing apparatus according to claim 32, further comprising image forming means for forming an image of the original scanned by said scanning means on a recording medium, wherein said control means controls an image forming magnification of the image in response to either one of the outputs from said first and second detecting means. 
     
     
       38. An image processing apparatus according to claim 32, further comprising image forming means for forming an image of the original scanned by said scanning means on a recording medium, wherein said control means selects the size of the recording medium in response to either one of the outputs from said first and second detecting means. 
     
     
       39. An image processing apparatus according to claim 32, wherein said scanning means comprising reading means for reading the original in order to output an image signal and wherein said first detecting means detects the size of the original in response to the image signal output by said scanning means by prescanning the original.